Drier compositions



United States Patent ice DRIER COMPOSITIONS Gordon Kirke Wheeler, Trumbull, Conn., assignor to R. T. Vanderbilt Company, Inc., New York, N.Y., a corporation of New York No Drawing. Filed Oct. 3, 1958, Ser. No. 765,046

9 Claims. (Cl. 106310) The present invention pertains to compositions of matter, and more particularly to drier compositions.

Coating compositions, such as paints, printing inks, linoleum print paints, varnishes and enamels, contain a film-forming base, typical examples of which include drying or semi-drying oils, such as linseed oil, dehydrated caster oil, soya bean oil, oiticica oil etc.; esters of the acids derived from the drying or semi-drying oils and polyhydric alcohols, such as glycerol, ethylene glycol, sorbitol, etc.; the pure esters of the drying or semi drying oil fatty acids, such as linoleic acid, oleic acid, etc., and polyhydric alcohols, such as ethylene glycol, glycerol, mannitol, etc.; drying or semi-drying oil modified resins, such as the modified alkyd resins prepared, for example, by the esterification of glycerol, phthalic anhydride and the drying or semi-drying oil fatty acids; the modified phenolic resins prepared, for example, by the reaction of cresols, formaldehyde and the drying or semi-drying The modifier or accelerator for the metallic drier is an d-sllbsfitllted pyridine compound as set forth below.

2-(2-pyridy1)-benzimidazole 1- 2-pyridylazo) -2-n aphthol 2-picolylamine oils; the modified esters of rosin or modified rosins preparedv for example, by the esterification of rosin, glycerol or pentaerythritol and the drying or semi-drying oil fatty acids; modified latex emulsions, such as butadiene-styrene copolymers; and other conventional film-forming bases. These coating com ositions may also contain pigments, such as titanium dioxide, carbon black, etc.; extenders and fillers, such as calcium carbonate, wood flour, clay, etc.; resins, such as urea formaldehyde, rosin, etc.; solvents, such as toluene, xylol, turpentine, etc.; thinners such as mineral spirits; and plasticizers, etc.

In order to decrease the drying time of such coating compositions it has been the practice heretofore to in-. corporate therein conventional metallic driers which are metal salts of carboxylic acids, typical examples of which include naphthenates, oleates, linoleates, octoates, and resinates of manganese, lead, cobalt, calcium and iron. While such metallic driers decrease the drying time of the coating compositions, such compositions, never-the less, still have an excessively high drying rate for many applications. Moreover, such coating compositions containing a metallic drier frequently exhibit poor drying time stability upon aging of the compositions. Similarly, coating compositions, such as aged modified latex paints, containing a metallic drier give poor results when subjected to scrubbability tests.

Accordingly, it is the object of the present invention to provide drier compositions which will impart decreased drying time to coating compositions, which will give the coating compositions drying time stability even after ageing thereof, and which will greatly improve the scrubbability of coating compositions, such as aged modified latex paint. a

The drier compositions of the present invention comprise a metallic drier and a modifier or accelerator for 1 resinates of manganese, lead, cobalt, calcium and iron.

2-pyridinemethaldoxime Z-pyridinealdoxime 2-(2-pyridyl)-benzoxa zole l N \N Z-pyridinaldazine bis-(2-pyridinal) -ethylenediarnine compounds did not so function, but rather they actually increased the drying time of coating compositions containing a metallic'drier: 2-pyridinal aniline, 2-cyanopyridine, mono-(2-pyridinal) -p-phenylenediamine, and Z,

6-pyridine dicarboxylic acid.

The amounts of metallic drier and modifier or accele erator presentin the drier compositions vary With-the. nature of the film-forming base present in the coating compositions to which the drier compositions are to be added as well as with the presence or absence ofjo'tlier compatible adjuvants present inwthe, coating compositions.

In general, however, the weight ratioof modifier or accelerator to the metal content in the metallic drier lies Patented Nov. 22, 1960 V in the range from about 0.1:1 to about 61:1, and preferably in the range from about 2:1 to about 30:1.

The drier compositions can be prepared merely by mixing the metallic drier with the accelerator or modifier,

in the fifth and sixth columns of Table I above for each of Examples 2-10 respectively.

EXAMPLE 11 or by dissolving them in a suitable common solvent 5 H I hi does not have an adverse fi t upon the fil Scrubbab1l1ty tests us1ng 2,2 -d1pyr1dylam1ne were carforming base present in the coating compositions. If out h h e1kyd'md1fied late)? emhlelell P t y desired, the metallic drier and the modifier or accelerator method elmllef to that eleseflhed 111 Federal Specificatherefor can be added separately to a coating composih -P sefllhhablhtyi thus meaeufed, helllg e011- ti t f m th d i composition h i sidered an 1ndex of the progress of curing or drying of The amount of the drier compositions which is used the These ieste were full 9 a Gardner in coating compositions containing a film-forming base is Medel 105 stralght Llhe Washehihty and Ahfaslen a very small amount, for example, 0.02% by weight of ehihe- The Plate glass Panels were Primed with a metal based on the weight of the film-formi b mercial enamel undercoater tinted medium grey. The

The drier compositions of the present invention will underwater was aipdfiedtwo y 50% be further illustrated in connection with the following alive y), baked two hours at 's then examples which employed a typical metallic drier, namely lowed t0 y at least one y more before pp y manganese naphthenate, and a typical film-forming base the test paint.- The undercoater and test paint (aged or vehicle of a coating composition, namely Aroplaz two days) wereapplied, using a Dow Film Caster which 2464 which is a medium length, soya bean oil, phthalic delivers a dry film thickness of approximately 2.2 mils alkyd resin having petroleum spirits. as a solvent and (und rwater) and 1.8 mils (test paint), to four such containing 49-51% solids, 49% oil acids and 34% undercoated panels and allowed to air dry three days. phthalic anhydride. These films were then scrubbed to failure or, if no failure occurred, to a maximum of 6000 cycles. One-half EXAMPLES 1 THROUGH 10 of one percent Ivory soap solution was used as a lu- Aroplaz 24 4 was reduced from 50% to 445% 1- bricant, the solution being added frequently so as to keep ids with mineral spirits and divided into ten equal porthe test P Surface P pe wetted at all hmes- The tions. To the first portion, which served as a blank for results these q p 'f tests were averaged and comparison purposes, th was dd d a 6% manganese entered 1n a table of observations set forth below. naphthenate solution in an amount suchthat the vehicle After g 5 51X weeks, the Paints were retested contained 0.02% by weight of manganese based on the for sefllhhablhly the Seine manner aheve. nonvolatile content of the vehicle. To the remaining e used In 'lhls h y 15 as fellows wllh lhgfedlellls nine portions there were separately added drier comlisted 111 Order Of addlheni positions of the invention containing both manganese naphthenate and a modifier or accelerator therefor as Alkyd emulsion identified below in an amount such that the vehicle also contained 0.02% by weight of manganese based on the P 1 G1 nonvolatile content of the vehicle. The ten mixtures Oums were immediately cast as clear, unpigmented films on r plate glass at 2.2 mils wet film thickness using a 0.004 40 i: lzf fiiiisiiifihfiiiii iihgma jiij 01i? inch clearance applicator blade. The drying times were Y S -1 63 (1-22 4. Triton X-100 (a IlOIllOlllC wetting agent ol the measured on a Gardner Drygraph in an air cond t oned oct lphenox ethunoltype) 2.71 0.20 room kept at a temperature of 74 F. and at 50% rela- Dovieide (2D%.5P11mn) (so-50% orthoplenylpnenol sodunu salt, tive humidity. After aging for a period of two months, pentachlorophenol sodiuntsalnn 10. 04 1.43

6. P at thi k n 157 solution ascol l drying F h agam (.letermm?d on slmdar films.of hri o i asshi m hg dioxideoit easzaiill..051 ...v 83.10 9.56 the same identical ten mixtures, 1n order to determme the drying time stability of the compositions. The. data figment dlspersmn for these two tests are set forth in Table I below. water 119. 00 14. 20 t a tass'un 0 0s ate 15.55 1.71 The data set forth in the fiftlrcolumn of Table I f gfi 259.00 7'14 below show that the dr1er compositions of the invention 10. Magnesium silicate 108.00 7.07 (Examples 2l0) containing an accelerator or modifier Llthwme impart to film-forming bases of coating compositions a Reduction drying time considerably less than that imparted thereto 12 water I 2M2 by a metallic drier alone (Example 1) and accordingly 3. tif ger (39%) p l fi 4.33 0.5 2 demonstrate. that the modifiers do accelerate or increase tyrene' (67/33) (4 226'00 the drying action of a metallic drier upon a film-form- 1,210.31 100.00 ing base. Coating compositions containing the drier Table 1 Manga- Weight Drygraph-Hours Example nese Ratio No. Modifieror Accelerator (Percent Modifier y to Man- Initial 2 Months weight) ganese None (b1ank). 0.02 21 16 2-(2-Pyrldyl)-benzlm1dazole 0.02 15. 2/1.0 4.7 4.2 l-(2-Pyridy1azo)-2-naphthol 0.02 7.6/1.0 8.0 4.3 2-Plcoly1amlne 0.02 30411.0 4.1 6.1 2,2-Dlpyridylamine 0.02 30.4/L0 5.0 4.0 Z-Pyridinemethaldoxtme- 0.02 1.9/1.0 14 12 2-Pyridinealdoxime 0. 02 1.9/1.0 16 14 2-(2-Pyridyl)-benzoxazo 0.02 3.8/1.0 17 12 2-Pyridlnaldazine 0. 02 15.2/1.0 11 6.0 Bis-(Z-pyrldinal)-ethylenediamine. 0. 02 304/10 11 9.0

compositions of the invention also have gooddrying time 2-,2'-dipyridylamine was added to the finished paint stability even after aging thereofas shown by the data as a 5% solution (by weight) in hexyleneglycol.

Table of observatzons Percent (on wt. of Gardner Scrubbalkyd modifier) ability (Cycles to Weight Failure) Mixture Ratio:

N o. Amine] Cobalt 2,2- Metal Fresh Paint Metal Dipyridyl- Paint Aged amine 6 Weeks It will be noted from the data in the above table that the use of a typical aforementioned a-substituted pyridine compound, namely 2,2'-dipyridylamine, with a typical metallic drier, namely cobalt naphthenate, improves the scrubbability of the modified latex paint to a very considerable degree. It is believed that these (at-substituted pyridine compounds function by giving a higher degree of cure of the film, both initially and upon aging of the composition. Possibly this higher degree of cure results in improved adhesion of the film to the substrate.

It will be appreciated that various modifications and changes may be made in the invention set forth herein without departing from the spirit thereof and accordingly the invention is to be limited only within the scope of the appended claims.

I claim:

1. A drier composition for decreasing the drying time of coating compositions consisting essentially of a metallic drier and an tat-substituted pyridine compound as an accelerator therefor selected from the group consisting of 2-(2-pyridyl)-benzimidazole, 1-(2-pyridylazo)-2 naphthol, 2-picolylamine, 2,2'-dipyridylamine, Z-Pyridinemethaldoxime, Z-pyridinealdoxime, 2-(2-pyridyl)-benzoxazole, Z-pyridinaldazine, and bis-(2-pyridinal)-ethylenediamine; the weight ratio of the accelerator to the metal content in the metallic drier lying in the range from about 0.1:1 to about 61:1.

2. A drier composition as set forth in claim 1 wherein the weight ratio of the accelerator to the metal content in the metallic drier lies in the range from about 2:1 to about :1.

3. A drier composition as set forth in claim 1 wherein the metallic drier is manganese naphthenate.

4. A drier composition as set forth in claim 1 wherein the metallic drier is cobalt naphthenate.

5. A drier composition as set forth in claim 1 wherein the accelerator is 2-(2-pyridy1)-benzimidazole.

6. A drier composition as set forth in claim 1 wherein the accelerator is 1-(2-pyridylazo)-2-naphthol.

7. A drier composition as set forth in claim 1 wherein the accelerator is Z-pieolylamine.

8. A drier composition as set forth in claim 1 wherein the accelerator is 2,2'-dipyridylamine.

9. A drier composition as set forth in claim 1 wherein the accelerator is 2-pyrid naldazine.

References Cited in the file of this patent UNITED STATES PATENTS 2,075,230 Schatz Mar. 30, 1937 2,526,718 Wheeler Oct. 24, 1950 2,852,405 Myers et a1 Sept. 16, 1958 FOREIGN PATENTS 498,011 Great Britain Dec. 29, 1938 509,767 Canada Feb. 1, 1955 

1. A DRIER COMPOSITION FOR DECREASING THE DYING TIME OF COATING COMPOSITIONS CONSISTING ESSENTIALLY OF A METALLIC DRIER AND AN X-SUBSITUTED PYRIDINE COMPOUND AS AN ACCELERATOR THEREFOR SELECTED FROM THE GROUP CONSISTING OF 2-(2-PICOLYDYL)-BENZIMIDAZOLE, 1-(2-PYRIDYLAZO)-2 - NAPHTHOL , 2-PICOLYLAMINE, 2,2''-DIPYRIDYLAMINE, 2-PYRIDINEMETHALDOXIME, 2-PYRIDINEALDOXIME, 2-(2-PYRIDINAL)-BENZOXAZOLE, 2-PYRIDINALDZINE, 2,2''/DIPRIDYLAMINE, 2-PYRIDINEMETHTHE WEITH RATIO OF THE ACCELERATOR TO THE METAL CONTENT IN THE METALLIC DRIER LYING IN THE RANGE FROM ABOUT 0.1:1 TO ABOUT 61:1. 